Sourced.

I find it funny how the weapon in her left hand reminds me of Ragna's blood edge while the other weapon reminds me of Order Sol's Fuuenken[?].

The one in her right hand (viewer's left) is a chainsword.

Also, Order Sol did not have Fuuenken.

... Who's head is that in the second meat on the left side?

its the artis him self (the head with glasses)
he likes self protraing him, hidden somewhere on the pic